Some of the people I have contacted have told me that they entered Canada without a travel letter despite their classes being online. Has anyone else any similar experiences
Nobody states that a travel letter from the university is necessary. If you have valid reasons why your travel should be classified as essential then you should be fine.
Was your study permit approved before March 18? Are you in a country where the time zone difference would put your online classes in the middle of the night?
Some of the people I have contacted have told me that they entered Canada without a travel letter despite their classes being online. Has anyone else any similar experiences